作者：孙学飞1, 申群太1,  黄永锋2

单位：1、中南大学 信息科学与工程学院  湖南长沙  410083；

　　　2、长沙钛合电子设备有限公司  湖南长沙  410083

中图分类号：TP216 

文献标识码：A    

文章编号：1006-883X（2011）10-0017-04

摘要：为在不同大气压力环境下，精确测量热式差压传感器采集的差压信号，设计了基于压力补偿的高精度智能变送器。系统由热式差压传感器、压力补偿放大器模块、变送输出模块组成。给出了完整的系统低功耗设计框图，提出了一种在传统变送器基础上复合绝压传感器进行大气压力补偿的方法，实现了变送器的自校准功能。描述了压力补偿放大器模块和变送输出模块的设计方案，分析了系统的软件处理流程。目前,该智能变送器已经投入实际使用，系统结构简单，经现场测试，精度高且长期运行稳定，效果良好。

关键词：热式差压传感器；压力补偿；高精度；智能变送器；低功耗

Design of intelligent converter with high accuracy based on pressure compensation

SUN Xue-fei1,  SHEN Qun-tai1 , HUANG Yong-feng2

1.College of Information Science and Engineering, Central South University, Changsha 410083, China;

2. Changsha titanium and electronic equipment Co., Ltd, Changsha 410083, China

Abstract: In order to measure the differential pressure signals precisely from MEMS-based thermo-differential pressure sensors in the environments with different atmospheric pressures, an intelligent transducer system with high accuracy is designed based on pressure compensation. The system consists of MEMS-based thermo-differential pressure sensor, pressure compensation amplifier module and transforming output module. A complete design diagram of low power consumption is provided, a atmospheric pressure compensation method using absolute pressure sensor based on the traditional transducer is proposed, and the self-calibrating function of transducer is realized. The design proposals for the pressure compensation amplifier module and transforming output module are described, and the flow chart of systematic software is analyzed. This intelligent transducer has worked stably for a long time with good performance in many practical applications until now. The field tests show that the system is portable, has simple structure, ultra-low power consumption and high accuracy.

Keywords: MEMS-based thermo-differential pressure sensor ; pressure compensation; high accuracy; intelligent transducer; ultra-low power consumption

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备注：2011年 第17卷 第10期